YASKAWA MP920 - Page 289

Appendix C C Language Sample Programs
C.2.1 TCP (When Using Extended MEMOBUS Protocol)
C-14
// Extended MEMOBUS Data Length
memex_len = (unsigned short)((unsigned char)rbuf[13]) << 8;
memex_len += (unsigned short)((unsigned char)rbuf[12]);
// Checks the extended MEMOBUS data length.
if (( data_len - 14) != memex_len )
// Extended MEMOBUS data length
¼Total data length - 218 header (12 bytes) -
// Extended MEMOBUS length (2 bytes)
{
rc = -3;
return( rc );
}
// Checks the MFC.
if ( rbuf[14] != 0x20 )//
MFC is fixed to 0x20
.
{
rc = -4;
return( rc );
}
// Checks the SFC.
// Checks within mk_rsp_data().
return( rc );
}